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Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)

Rev. Sci. Instrum. 75, 3387 (2004); doi:10.1063/1.1785275

Published 1 October 2004

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W. X. Ding, D. L. Brower, and B. H. Deng
Electrical Engineering Department, University of California-Los Angeles, Los Angeles, California 90095

D. Craig, S. C. Prager, and V. Svidzinski
Physics Department, University of Wisconsin-Madison, Madison, Wisconsin 53706
Far-infrared laser polarimetry with time response up to ~1  µs and spatial resolution ~8  cm has been successfully implemented on the Madison Symmetric Torus reversed-field pinch. Internal magnetic field and current density fluctuations are nonperturbatively measured. This is accomplished by taking parallel polarimetry chords which measure the line-integrated magnetic field fluctuations via Faraday rotation. With suitable analysis we are able to obtain information on spatial profiles of magnetic field fluctuations and current density fluctuations. Coherent interaction between these fluctuations is also measured and observed to generate an electromagnetic fluctuation-induced torque <deltaJ×deltaB>. ©2004 American Institute of Physics
History: Presented 19 April 2004; published 1 October 2004
Permalink: http://link.aip.org/link/?RSINAK/75/3387/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.70.Kz
    Optical (ultraviolet, visible, infrared) plasma diagnostic measurements
  • 52.58.Lq
    Z-pinches, plasma focus, and other pinch devices
  • 52.25.Fi
    Plasma transport properties
  • YEAR: 2004

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PUBLICATION DATA

ISSN:
0034-6748 (print)   1089-7623 (online)
Publisher:
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REFERENCES (9)
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